<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Function start</title>
    <style>
      .msgBox {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        width: 242px;
        background: #eee;
      }

      .msgBox p {
        line-height: 1.5;
        padding: 10px 20px;
        color: #333;
        padding-left: 82px;
        background-position: 25px center;
        background-repeat: no-repeat;
      }

      .msgBox button {
        background: none;
        border: none;
        position: absolute;
        top: 0;
        right: 0;
        font-size: 1.1rem;
        color: #aaa;
      }

    </style>
  </head>
  <body>
    <button>Display message box</button>

    <script>
        function displayMessage(msgText,msgType) {
            const html = document.querySelector('html');

            const panel = document.createElement('div');
            panel.setAttribute('class','msgBox');
            html.appendChild(panel);


            const msg = document.createElement('p');
            msg.textContent = msgText;
            panel.appendChild(msg);


            const closeBtn = document.createElement('button');
            closeBtn.textContent = 'x';
            panel.appendChild(closeBtn);


            closeBtn.onclick = function() {
                panel.parentNode.removeChild(panel);
            }
            if (msgType=== 'warning') {
                msg.style.backgroundImage = 'url(icons/warning.png)';
                panel.style.backgroundColor = 'red';
            }else if(msgType === 'chat') {
                msg.style.backgroundImage = 'url(icons/chat.png)';
                panel.style.backgroundColor = 'aqua';
            }else {
                msg.style.paddingLeft = '20px'
            }
        
        }
        const btn = document.querySelector('button');
        btn.onclick = function() {
            displayMessage('Woo, this is a different message!','chat')
        }
      
    </script>
  </body>
</html>